89465127’s gists

89465127 / scala_collections.scala

Last active December 16, 2015 10:58

Simple experiments with scala lists and maps.

	// define a simple list
	scala> val l = List("a", "b", "c")
	l: List[java.lang.String] = List(a, b, c)

	// print each element of the list
	scala> l.foreach{ println }
	a
	b
	c

89465127 / java_scala.bash

Created April 18, 2013 23:42

How to compile and run HelloWorld programs in java and scala through the command line terminal, with jar dependencies.

	#Compile HelloWorld, with jars in this directory
	javac -cp ".:*" HelloWorld.java
	scalac -cp ".:*" HelloWorld.scala

	#Run
	java -cp ".:*" HelloWorld
	scala -cp ".:*" HelloWorld

	# HelloWorld.java
	class HelloWorld {

89465127 / maven_scala.bash

Created April 18, 2013 22:03

Setting up & running a simple hello world project with Scala and Maven

	# first we'll create a new project

	mvn archetype:generate -DarchetypeGroupId=org.scala-tools.archetypes -DarchetypeArtifactId=scala-archetype-simple -DgroupId=myGroup -DartifactId=myTestProject -Dversion=1.0 -DinteractiveMode=false


	# then we will package it to create a jar, and populate target/

	cd myTestProject
	optional: rm -rf src/test
	mvn package

89465127 / Jongo.java

Last active December 15, 2015 18:49

The "Hello World" of Java and MongoDB

	// Jongo.java

	import com.mongodb.Mongo;
	import com.mongodb.MongoClient;
	import com.mongodb.MongoException;
	import com.mongodb.WriteConcern;
	import com.mongodb.DB;
	import com.mongodb.DBCollection;
	import com.mongodb.BasicDBObject;
	import com.mongodb.DBObject;

89465127 / reduce_example.py

Created April 1, 2013 06:33

Examples of how to use reduce() in python

	# The reduce() function applies a function which will reduce the sequence to a single value.
	# There are a number of special-purpose reduce functions that we’ve already seen.
	# These reductions include sum(), any(), all().

	def red_max(x, y):
	return x if x > y else y

	def red_sum(x, y):
	return x + y

89465127 / locate_site_packages.py

Created April 1, 2013 04:31

python site-packages location

	print 'If you are running ubuntu, the site-packages is in:'
	print '/usr/local/lib/pythonX.X/dist-packages'
	print
	print 'Otherwise it\'s here:'
	from distutils.sysconfig import get_python_lib;
	print get_python_lib()

89465127 / map_example.py

Created March 30, 2013 05:45

Examples of map() built-in that follow the official python documentation at http://docs.python.org/2/library/functions.html#map

	# map(function, iterable, ...)
	#
	# http://docs.python.org/2/library/functions.html#map


	nums = range(5)
	extended_nums = range(10)

	double = lambda x: x*2
	concat = lambda x,y: "{x}{y}".format(x=x, y=y)

89465127 / lambda_map.py

Created March 30, 2013 05:25

A couple ways to use map() when you need nested function calls.

89465127 / csv_dictreader_example.py

Created March 29, 2013 20:25

Uses csv.DictReader and StringIO to read a sample csv file. No external file is required.

	import csv
	import StringIO
	# cStringIO is faster, but cannot handle unicode characters

	def main():
	f = StringIO.StringIO('language,greeting\nenglish,hello\nspanish,hola')
	for _dict in csv.DictReader(f):
	print _dict

	if __name__ == '__main__':

89465127 / argparse_files.py

Last active August 27, 2022 14:24

Get a list of filenames using argparse (updated to use default formatter)

	import argparse
	import os
	import glob

	def main():
	#Does not currently have support to read files from folders recursively
	parser = argparse.ArgumentParser(description='Read in a file or set of files, and return the result.', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
	parser.add_argument('path', nargs='+', help='Path of a file or a folder of files.')
	parser.add_argument('-e', '--extension', default='', help='File extension to filter by.')
	args = parser.parse_args()